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import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.jfree.chart.*;
import org.jfree.data.category.*;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.xy.*;
import org.jfree.data.*;
import org.jfree.chart.renderer.category.*;
import org.jfree.chart.plot.*;
import java.awt.*;
public class ChartServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("image/png");
ServletOutputStream sos = response.getOutputStream();
JFreeChart chart = getBarChart();
ChartUtilities.writeChartAsPNG(sos, chart, 400, 400);
}
public JFreeChart getBarChart() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.setValue(2, "Marks", "Rahul");
dataset.setValue(7, "Marks", "Vinod");
dataset.setValue(4, "Marks", "Deepak");
dataset.setValue(9, "Marks", "Prashant");
dataset.setValue(6, "Marks", "Chandan");
JFreeChart chart = ChartFactory.createBarChart (
"BarChart using JFreeChart","Student", "Marks", dataset,
PlotOrientation.VERTICAL, false,true, false);
chart.setBackgroundPaint(Color.yellow);
chart.getTitle().setPaint(Color.blue);
CategoryPlot p = chart.getCategoryPlot();
p.setRangeGridlinePaint(Color.red);
return chart;
}
}
web.xml
<servlet>
<servlet-name>ChartServlet</servlet-name>
<servlet-class>ChartServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ChartServlet</servlet-name>
<url-pattern>/ChartServlet</url-pattern>
</servlet-mapping>
</web-app>
chartviewer.html
<html>
<head><title>JFreeChart with JSP example</title></head>
<body>
<center>
HTML에서 ChartServlet을 사용하는 예제
<hr width="50%">
<img src="/ChartServlet">
</center>
</body>
</html> | |
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